/*******************************************************************************
 * Copyright (c) 2012-2017 Codenvy, S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.api.workspace;

import com.google.common.annotations.Beta;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.GwtEvent;

import org.eclipse.che.api.core.model.workspace.WorkspaceConfig;
import org.eclipse.che.ide.api.resources.Project;

/**
 * Workspace projects loaded events describe situation when new workspace configuration has been received and workspace
 * context have to be initialized with remote projects.
 * <p/>
 * This event is intended to be fired when workspace has started and configured and projects has been successfully loaded.
 * <p/>
 * By design this event is intended to initialize third party components with initial projects configuration.
 *
 * @author Vlad Zhukovskiy
 * @since 4.4.0
 */
@Beta
public class WorkspaceReadyEvent extends GwtEvent<WorkspaceReadyEvent.WorkspaceReadyHandler> {

    /**
     * A workspace change listener is notified of projects loading.
     * <p/>
     * Third party components may implement this interface to handle workspace projects loading event.
     */
    public interface WorkspaceReadyHandler extends EventHandler {
        /**
         * Notifies the listener that some workspace configuration changes are happening. The supplied event dives details.
         *
         * @param event
         *         instance of {@link WorkspaceReadyEvent}
         * @see WorkspaceReadyEvent
         * @since 4.4.0
         */
        void onWorkspaceReady(WorkspaceReadyEvent event);
    }

    private static Type<WorkspaceReadyHandler> TYPE;

    public static Type<WorkspaceReadyHandler> getType() {
        if (TYPE == null) {
            TYPE = new Type<>();
        }
        return TYPE;
    }

    private final Project[] projects;

    public WorkspaceReadyEvent(Project[] projects) {
        this.projects = projects;
    }

    /**
     * Returns the new workspace configuration.
     *
     * @return the new workspace configuration
     * @see WorkspaceConfig
     * @since 4.4.0
     */
    public Project[] getProjects() {
        return projects;
    }

    /** {@inheritDoc} */
    @Override
    public Type<WorkspaceReadyHandler> getAssociatedType() {
        return TYPE;
    }

    /** {@inheritDoc} */
    @Override
    protected void dispatch(WorkspaceReadyHandler handler) {
        handler.onWorkspaceReady(this);
    }
}
